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Practical guides on cleaning, converting and formatting text — each one local-first, so your data never leaves the browser.

How to edit AI-written text so it stops reading like AI

The phrases, rhythms and invisible characters that mark a draft as machine-written — and a repeatable editing pass that removes them without flattening it.

Extract and format phone numbers from text

Pull phone numbers out of messy text and normalize them to E.164 or national format entirely in your browser, so a contact list never leaves your device.

How to control AI crawlers with robots.txt

Allow or block GPTBot, ClaudeBot, Google-Extended and other AI crawlers in robots.txt — what each bot does, and why training and answers are different choices.

Unicode normalization and accent stripping explained

Same-looking text that will not match? Learn the Unicode normalization forms and how to strip accents for URLs and search, all in your browser, no uploads.

Detect and remove zero-width characters from your text

Detect invisible and zero-width Unicode characters hidden in pasted text, and clean them out in your browser: no upload, no account, and works offline.

Solve anagrams, palindromes, and word puzzles in your browser

Verify anagrams, find palindromes, check pangrams and scramble words, all in your browser with no uploads. Free tools for word games and for teaching.

Create a digital business card: vCard, QR codes, and contact links

Build shareable digital business cards with vCard files and QR codes. Add mailto and WhatsApp contact links, all processed in your browser with zero uploads.

Calculate chmod permissions and subnet ranges: a DevOps quick reference

Convert file permissions to chmod octal notation and work out IP subnet ranges from CIDR. Fast, local tools for sysadmins and for DevOps engineers alike.

Validate IBANs, credit cards, and emails in your browser

Format validation for IBANs, credit cards, email addresses and URLs in your browser. No upload, no account, works offline: catch errors before you submit.

Understanding cron expressions: write schedules like a developer

Learn to read and write cron expressions: parse the five fields, master common patterns, and turn schedules into calendar events. All in your browser.

Convert YAML, JSON, and generate TypeScript types in your browser

Convert between YAML, JSON and .env, and generate TypeScript types from JSON. Everything happens in your browser: no uploads, no accounts, offline-ready.

Format XML and convert to JSON for APIs

Pretty-print tangled XML and convert to JSON formats in your browser. No upload, no account. Handle legacy APIs and modern data flows locally and securely.

Format and minify CSS for better debugging and performance

Learn how to beautify minified CSS for debugging and minify your stylesheets for production. Free CSS tools that run in your browser, no upload needed.

Format and minify SQL online

Format messy SQL queries into readable code, or minify one for embedding, all in your browser with no upload. Works offline and keeps your data private.

Convert CSV to HTML tables and JSON without a spreadsheet

Turn CSV exports into HTML tables or JSON instantly, in your browser. Handle any delimiter, deduplicate rows by column and keep the file off any server.

Shannon entropy and password strength

Learn what Shannon entropy is and how it measures password strength in bits. Discover why length matters more than symbols, and how to reach true security in your browser.

How to count syllables and measure text readability

Learn how syllable count and readability scores help you write clearer text. Measure Flesch score and reading time instantly in your browser, no upload.